The Rock-EXD is an upgraded version of the popular Rock-EX that includes a large diameter speed dial for the absolute finest degree of zoom speed control. The speed dial allows the operator to set and mark the maximum desired speed and the feather the variable zoom rocker for delicate and repeatable zooms. Works with Sony PMW-300, -200, -160, -EX1, or -EX3 camcorders. With its high-sensitivity rocker, precise, repeatable zooms are easily achieved. The VZ Rock-EX is perfect for tripods, stabilizers, jibs and shoulder supports.